I am writing lots of mathematics within electrical engineering, where I often need to specify which of two connection types I am talking about.
One is called Delta, specified with a triangle
$\Delta$. The other is called Wye/Star, a three legged star with
$120\degree$ separated legs, like in the picture below.
What I wish for is a way to inline with the mathematics write
$\wye$ and get the depicted symbol the same way I get
$\Delta$, but I am not very experienced with defining new symbols...